Extruding outward from center point to create the Bottle Cap Grip
Extrusion:


Way 1:
Select the faces, hit "e". Rightclick immediatly afterwards (that creates the extrusion but doesn't move it). Then hit "s" and "shift z" and move the mouse to scale them outwards.

Way 2:
Hit "i". Move the mouse to scale the new faces the same size as the original one. Now press &amp; hold "ctrl" and move the mouse.


Further adjustment (optional)
Set "individual origins" and hit "s" to scale them smaller
Bevel
Hit "ctrl + b" to bevel them, use mouse drag + mouse wheel to adjust number of steps (roundness) and shape.